Local Light-Controlled Generation of Calcium Carbonate and Barium Carbonate Biomorphs via Photochemical Stimulation Menichetti, Arianna García Ruiz, Juan Manuel Photo-induced crystallization Calcium carbonate Biomorphs Ketoprofen Photochemistry The authors thank the European Research Council under the European Union's Seventh Framework Program (FP7/20072013)/ERC grant agreement no 340863 and ERC PoC LACRYS (837874) as well as Junta de Andalucia for financing the project P18-FR-5008. HC thanks the Deutsche Forschungsgemeinschaft DFG for financial support of the work on Biomorphs (CO 194/28-1). M.M., A.M., and A.M.-P. thank MIUR, (PRIN 2017) 2017E44A9P. Open access funding enabled and organized by Projekt DEAL. Photochemical activation is proposed as a general method for controlling the crystallization of sparingly soluble carbonates in space and time. The photogeneration of carbonate in an alkaline environment is achieved upon photo-decarboxylation of an organic precursor by using a conventional 365 nm UV LED. Local irradiation was conducted focusing the LED light on a 300 μm radius spot on a closed glass crystallization cell. The precursor solution was optimized to avoid the precipitation of the photoreaction organic byproducts and prevent photo-induced pH changes to achieve the formation of calcium carbonate only in the corresponding irradiated area. The crystallization was monitored in real-time by time-lapse imaging. The method is also shown to work in gels. Similarly, it was also shown to photo-activate locally the formation of barium carbonate biomorphs. In the last case, the morphology of these biomimetic structures was tuned by changing the irradiation intensity. 2021-09-22T11:01:24Z 2021-09-22T11:01:24Z 2021-07-08 info:eu-repo/semantics/article A. Menichetti... [et al.], Chem. Eur. J. 2021, 27, 12521. [10.1002/chem.202102321] http://hdl.handle.net/10481/70362 10.1002/chem.202102321 eng info:eu-repo/grantAgreement/EC/FP7/340863 info:eu-repo/grantAgreement/EC/H2020/837874 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Wiley-VCH Verlag GmbH